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A kind of hierarchical structure coating separator for lithium-sulfur battery and preparation method thereof

A hierarchical structure, lithium-sulfur battery technology, applied in the direction of lithium batteries, structural parts, secondary batteries, etc., can solve the problems that the physical mixing of various materials cannot be completely uniform, increase the material preparation process and application costs, and make it difficult to contribute to electronic pathways, etc. , to achieve the effects of green and environmentally friendly large-scale production, improved electrochemical performance, and easy large-scale production

Active Publication Date: 2021-09-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used are carbon material modified diaphragm, polymer modified diaphragm, metal organic framework compound modified diaphragm, among which carbon material has good electrical conductivity and can be used as the upper current collector, but its polarity is poor, and it is difficult to combine with polysulfide A strong interaction occurs; the polymer has good mechanical stability and can buffer the volume change of sulfur during charge and discharge, but its conductivity is not high and it is difficult to contribute to the electronic pathway; metal organic framework compounds have narrow pores and can act as ions The sieve suppresses the shuttle effect of polysulfides, but its electronic conductivity is very poor, which needs to be improved by mixing carbon materials
[0004] There are many reports on the modified diaphragm by mixing two compounds, which can take advantage of the advantages of each material and avoid the disadvantages of each material, but this method will inevitably increase the preparation process and application cost of the material, and the physical mixing of multiple materials cannot be completely uniform , the effect is limited, so the method of directly preparing the mixture of two compounds in one step is more effective

Method used

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  • A kind of hierarchical structure coating separator for lithium-sulfur battery and preparation method thereof
  • A kind of hierarchical structure coating separator for lithium-sulfur battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) Dissolve 1.354g of manganese acetate and 0.952g of benzoic acid as reaction substances in 40mL of diethylformamide, stir for 10h until completely dissolved, then add 1.295g of terephthalic acid and stir to dissolve;

[0053] (2) hydrothermal reaction at 200°C for 6 hours in a closed environment, and then naturally cooled to room temperature to obtain the reaction product;

[0054] (3) The reaction product was filtered to obtain a white solid, washed with distilled water and ethanol until the pH was neutral, and vacuum-dried and dehydrated at 60° C. for 24 hours to obtain a manganese-based coordination polymer;

[0055] (4) Heating the manganese-based coordination polymer to 600°C at a heating rate of 3°C / min in an argon atmosphere, keeping it for 2 hours and then cooling to obtain the MnO / C precursor;

[0056] (5) The MnO / C precursor was heated to 1000°C at a rate of 3°C / min in a nitrogen atmosphere with a purity of 99.9% (volume fraction), kept for 2 hours and then...

Embodiment 2

[0061] (1) Dissolve 1.354g of manganese acetate and 1.904g of benzoic acid as reaction substances in 40mL of diethylformamide, stir for 24 hours until completely dissolved, then add 2.59g of terephthalic acid and stir to dissolve;

[0062] (2) Hydrothermal reaction at 200°C for 12 hours in a closed environment, and then naturally cooled to room temperature to obtain the reaction product;

[0063] (3) The reaction product was filtered to obtain a white solid, washed with distilled water and ethanol until the pH was neutral, and vacuum-dried and dehydrated at 70°C for 24 hours to obtain a manganese-based coordination polymer;

[0064] (4) Heating the manganese-based coordination polymer to 600°C at a heating rate of 5°C / min in an argon atmosphere, keeping it for 2 hours and then cooling to obtain a MnO / C precursor;

[0065] (5) Heating the MnO / C precursor in a nitrogen atmosphere with a purity of 99.9% (volume fraction) to 1000°C at a heating rate of 5°C / min, keeping it for 2 ho...

Embodiment 3

[0070] (1) Dissolve 1.354g of manganese acetate and 1.904g of benzoic acid as reaction substances in 60mL of dimethylformamide, stir for 30h until completely dissolved, then add 3.885g of terephthalic acid and fully stir to dissolve;

[0071] (2) Hydrothermal reaction at 180°C for 10 hours in a closed environment, and then naturally cooled to room temperature to obtain the reaction product;

[0072] (3) The reaction product was filtered to obtain a white solid, washed with distilled water and ethanol until the pH was neutral, and vacuum-dried and dehydrated at 100°C for 20 hours to obtain a manganese-based coordination polymer;

[0073] (4) Heating the manganese-based coordination polymer to 550°C at a heating rate of 5°C / min in an argon atmosphere, keeping it for 3 hours and then cooling to obtain a MnO / C precursor;

[0074] (5) The MnO / C precursor was heated to 1100°C at a rate of 5°C / min in a nitrogen atmosphere with a purity of 99.9% (volume fraction), kept for 2 hours and...

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Abstract

The invention discloses a hierarchical structure coating separator for lithium-sulfur batteries and a preparation method thereof, belonging to the technical field of battery materials. The hierarchical structure coating separator for lithium-sulfur batteries provided by the present invention includes MnO / N-C material and base film; the MnO / N-C material has a unique hierarchical structure, MnO particles are covered by a uniform thin carbon layer, and nitrogen is embedded doped carbon microchips. The MnO / N-C material has a high specific surface area, which is conducive to the storage of liquid electrolytes, thereby improving the interfacial wettability of the separator / electrolyte, and facilitating the rapid diffusion of lithium ions to the electrodes along all directions; it can physically block the dissolved The diffusion of polysulfides can also be used as an upper current collector to improve the utilization of active materials, thereby improving the electrochemical performance of lithium-sulfur batteries; the preparation method of the MnO / N-C material is simple to operate, environmentally friendly and easy to scale production .

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a hierarchical structure coating separator for lithium-sulfur batteries and a preparation method thereof. Background technique [0002] With the rapid development of mobile electronic devices and electric vehicles, lithium secondary batteries with higher energy density are urgently needed for energy storage and power supply. However, lithium-ion batteries are still widely used in the market, but the theoretical capacity of the positive electrode is not high, and it is difficult to match high-energy-density batteries to meet the needs of application development. The positive electrode of the lithium-sulfur battery uses elemental sulfur as the active material. The theoretical specific capacity of sulfur is 1672mAh / g, and the theoretical energy density of the lithium-sulfur battery obtained by matching with the lithium metal negative electrode is 2600Wh / kg. It is widely re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02C01B21/082H01M50/431H01M50/449H01M50/451H01M10/052H01M10/42
CPCC01B21/0605C01G45/02C01P2004/04H01M10/052H01M10/4235Y02E60/10
Inventor 陈人杰徐赛男赵腾王丽莉叶玉胜吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY